[INFO] updating cached repository https://github.com/Dylan-DPC/cargo-stabilize
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 30ed4ac4d82a491b5a0dc7c476dea933b8eb4fc5
[INFO] checking Dylan-DPC/cargo-stabilize against master#30ca215b4e38b32aa7abdd635c5e2d56f5724494 for pr-66037
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDylan-DPC%2Fcargo-stabilize" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dylan-DPC/cargo-stabilize on toolchain 30ca215b4e38b32aa7abdd635c5e2d56f5724494
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Dylan-DPC/cargo-stabilize
[INFO] finished tweaking git repo https://github.com/Dylan-DPC/cargo-stabilize
[INFO] tweaked toml for git repo https://github.com/Dylan-DPC/cargo-stabilize written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Dylan-DPC/cargo-stabilize already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] aa620fbc87cc1ff6875d00afaa58c299a533b71f0e3db07f260273fddbe17cab
[INFO] running `"docker" "start" "-a" "aa620fbc87cc1ff6875d00afaa58c299a533b71f0e3db07f260273fddbe17cab"`
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]    Compiling clap_derive v0.3.0 (https://github.com/clap-rs/clap_derive#2622165b)
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking clap v3.0.0-beta.1 (https://github.com/clap-rs/clap#fc359e3c)
[INFO] [stderr]     Checking cargo-stamp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Lines`
[INFO] [stderr]  --> src/file.rs:6:50
[INFO] [stderr]   |
[INFO] [stderr] 6 |     io::{BufReader, Read, Seek, SeekFrom, Write, Lines},
[INFO] [stderr]   |                                                  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `at`
[INFO] [stderr]   --> src/file.rs:63:9
[INFO] [stderr]    |
[INFO] [stderr] 63 |         at: usize,
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_at`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Lines`
[INFO] [stderr]  --> src/file.rs:6:50
[INFO] [stderr]   |
[INFO] [stderr] 6 |     io::{BufReader, Read, Seek, SeekFrom, Write, Lines},
[INFO] [stderr]   |                                                  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/file.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let mut file = OpenOptions::new()
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/file.rs:146:13
[INFO] [stderr]     |
[INFO] [stderr] 146 |         let mut source = &mut contents[start..=end];
[INFO] [stderr]     |             ----^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `at`
[INFO] [stderr]   --> src/file.rs:63:9
[INFO] [stderr]    |
[INFO] [stderr] 63 |         at: usize,
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_at`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/file.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let mut file = OpenOptions::new()
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/file.rs:146:13
[INFO] [stderr]     |
[INFO] [stderr] 146 |         let mut source = &mut contents[start..=end];
[INFO] [stderr]     |             ----^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/file.rs:275:9
[INFO] [stderr]     |
[INFO] [stderr] 275 |         file.search_and_replace("bar", "an entire new line");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/file.rs:335:9
[INFO] [stderr]     |
[INFO] [stderr] 335 |         file.replace_at(2, "baz", "changed");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.40s
[INFO] running `"docker" "inspect" "aa620fbc87cc1ff6875d00afaa58c299a533b71f0e3db07f260273fddbe17cab"`
[INFO] running `"docker" "rm" "-f" "aa620fbc87cc1ff6875d00afaa58c299a533b71f0e3db07f260273fddbe17cab"`
[INFO] [stdout] aa620fbc87cc1ff6875d00afaa58c299a533b71f0e3db07f260273fddbe17cab